Why do I always have to urinate so badly after sex? Why do I always have to call my mother? Why do other people always have to fall to their knees and repent? Just normal biological functions, that's all.

Sex is better on crystal meth because both influence dopamine, a neurotransmitter in the brain that activates a certain pleasure center the one that also makes you want to cover your windows with aluminum foil. But, still, don't try this at home.

Now, if you want to add a vibrator to your trick bag--which we at Good Vibrations always recommend--pretty much any vibrator can do something fun, sensual, and interesting. Your best bet is a small, high-quality model.